CN111853342A - Valve core assembly with variable flow characteristic, regulating valve and regulating method of regulating valve - Google Patents
Valve core assembly with variable flow characteristic, regulating valve and regulating method of regulating valve Download PDFInfo
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- CN111853342A CN111853342A CN202010722905.5A CN202010722905A CN111853342A CN 111853342 A CN111853342 A CN 111853342A CN 202010722905 A CN202010722905 A CN 202010722905A CN 111853342 A CN111853342 A CN 111853342A
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- orifices
- inner sleeve
- orifice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
Abstract
The invention discloses a valve core assembly with variable flow characteristics, a regulating valve and a flow characteristic adjusting method of the regulating valve. The valve core assembly comprises an outer sleeve, an inner sleeve and a valve core, the outer sleeve, the inner sleeve, the valve core and the valve core are provided with orifice arrays which are periodically arranged along the circumferential direction, the inner sleeve and the outer sleeve can relatively rotate around an axis, so that in each group of corresponding periods, one row of orifices A are arranged0Can be connected with N rows of orifices AiOne of the rows is coincident to form a row of coincident orifices. Different flow characteristics can be realized by setting different forms of coincident throttling hole arrays. The valve core is arranged in the inner sleeve and can relatively slide along the axial direction of the inner sleeve so as to change the opening degree of the throttling hole combination. The invention can change the ideal flow characteristic of the sleeve by rotating the sleeve through the external adjusting structure on the premise of not disassembling the adjusting valve, thereby realizing free switching among different flow characteristicsAnd the valve is fast adapted to various working conditions, and the use convenience of the regulating valve is improved.
Description
Technical Field
The invention relates to a regulating valve, in particular to a valve core assembly with variable flow characteristics, a regulating valve and an adjusting method thereof.
Background
A regulating valve, also known as a control valve, is a valve with an actuating mechanism. According to the signal output by the control unit, the opening of the valve is changed by the adjusting valve through the actuating mechanism, and the control of the process parameters such as pressure, flow and the like in the system can be realized so as to meet the requirements of users. With the continuous improvement of the automation degree of modern industry, the regulating valve is widely applied to the industrial departments of metallurgy, energy, chemical industry, petroleum, military, water conservancy and the like increasingly and plays an irreplaceable role.
The flow characteristic of the regulating valve refers to the relationship between the relative flow (ratio of flow to rated flow) of the regulating valve and the relative stroke (ratio of valve stroke to rated stroke) of the regulating valve under a certain inlet-outlet pressure difference. Typical valve flow characteristics are linear flow characteristics, quick-opening flow characteristics and equal percentage flow characteristics. In current engineering applications, a regulating valve has only one flow characteristic when used online. In general, when the flow characteristic of the regulator valve is to be changed, the regulator valve needs to be disassembled and the orifice member needs to be replaced. This brings extra work burden to the maintenance personnel to make the system that governing valve belongs to can't run continuously, reduced work efficiency.
Disclosure of Invention
The invention aims to provide a valve core assembly and a regulating valve with variable flow characteristics, which change the flow characteristics through an external regulating structure on the premise of not disassembling the regulating valve. Further, the present invention also provides a flow characteristic adjustment method based on the proposed flow characteristic variable regulator valve.
The technical scheme adopted by the invention is as follows:
a variable flow characteristic valve core assembly includes an outer sleeve, an inner sleeve, and a valve core;
the outer sleeve is a hollow columnar part, a first throttling hole array which is periodically arranged along the circumferential direction is arranged on the outer wall of the outer sleeve, the period number is M, and M is more than or equal to 1;
the inner sleeve is a hollow columnar part, the inner sleeve is arranged in the outer sleeve, the outer wall surface of the inner sleeve is attached to the inner wall surface of the outer sleeve, the outer wall of the inner sleeve is provided with a fluid inlet and a fluid outlet and a second throttling hole array which is periodically arranged along the circumferential direction, the periodicity is M, and M is more than or equal to 1;
m periods in the first orifice array and M periods in the second orifice array are in one-to-one correspondence, wherein only one column of orifices A exists in each period of one array0Another array having N rows of orifices A per cycleiN is more than or equal to 2; the inner and outer sleeves are relatively rotated about the axis by a first actuator such that in each cycle there is a row of orifices A0Can be connected with the N rows of orifices AiOne of the rows is overlapped to form a row of overlapped throttle holes; in the relative rotation process of the inner sleeve and the outer sleeve, N throttling hole combinations can be formed in common, each throttling hole combination is composed of M combined throttling hole rows, and the flow characteristics of at least two throttling hole combinations in the N throttling hole combinations are different;
the valve core is a columnar part and is arranged in the inner sleeve, the outer wall surface of the valve core is attached to the inner wall surface of the inner sleeve, and the valve core is driven by the second actuating piece to relatively slide along the axial direction of the inner sleeve so as to change the opening degree of the throttling hole combination;
external fluid flows in from one of the orifice combination and the fluid inlet/outlet and flows out from the other.
Preferably, there is only one row of orifices a per cycle of the first orifice array0The second orifice array has N rows of orifices A in each cyclei(ii) a Preferably, 2. ltoreq. N.ltoreq.4.
Preferably, in the first orifice array, each row of orifices a0Has the same number of holes, each orifice A0The pore diameter of (A) is also the same; n rows of orifices A in each cycle of the second orifice arrayiEach orifice A iniAperture of and orifice A0Is the same as (a) in the above description,but with at least two rows of orifices AiSo that the two rows of orifices AiAnd a row of orifices A0The number of overlapping holes is different; preferably, in the first orifice array and the second orifice array, the pitch of any two vertically adjacent orifices in each row of orifices is equal.
Furthermore, in each of the orifice combinations, the number of superposed holes of the M superposed orifice rows is all the same, partially the same or completely different.
In each of the above embodiments, N in the second orifice array is 2, and the orifices a in one row are odd-numbered1And orifices A of an even column of adjacent columns2Is one cycle; two adjacent rows of orifices A on the outer sleeve and the inner sleeve1Pitch and two adjacent rows of orifices a2The pitch of the holes is equal to that of two adjacent rows of orifices A0Are equally spaced, and the orifices a of one adjacent row are1And a row of orifices A2With two adjacent rows of orifices A0Half of the pitch of (a).
Further, each row of orifices A0And each row of orifices A1The number and the pitch of the orifices in the two-stage flow meter are equal, and the combination of the orifices formed by the two has a linear flow characteristic; each row of orifices A0And each row of orifices A2The hole pitch of the orifices in (2) is equal, but the number of the orifices is different, and the combination of the orifices formed by the two has nonlinear flow characteristics.
Another object of the present invention is to provide a variable flow characteristic control valve, which includes a valve cover, a valve body and the valve core assembly of any one of the foregoing aspects; the valve cover is arranged on the valve body, and an internal flow passage leading from the valve inlet to the valve outlet is formed in the valve body; the valve core assembly is arranged in the internal flow passage, and fluid flowing in from the valve inlet is discharged from the valve outlet after flowing through the superposed throttling holes in the inner sleeve and the outer sleeve.
Preferably, the first actuating piece and the second actuating piece are valve rods, the bottoms of the valve rods are fixedly connected with the valve core, middle threads and lower threads are respectively tapped at the middle part and the lower part of the valve rods, a central threaded hole of the inner sleeve is formed in the top of the inner sleeve, and the valve rods sequentially penetrate through the central threaded hole of the inner sleeve and a central through hole of the valve cover; the valve rod can be meshed with the internal thread of the central through hole of the valve cover through the middle thread to form a screw pair for driving the valve rod and the valve core to axially move; when the valve core moves upwards to the limit position by rotating the valve rod, the valve core is contacted with the top end of the inner sleeve, meanwhile, the lower thread on the valve rod is meshed with the central threaded hole of the inner sleeve, the middle thread on the valve rod is not meshed with the central through hole thread of the valve cover, the valve rod continues to rotate along the original direction, and the inner sleeve is driven to rotate around the axis of the valve rod relative to the outer sleeve.
Preferably, the outer sleeve is clearance fit with the inner sleeve; the valve cover and the valve rod are sealed through a sealing filler and a filler gland; and a driving hand wheel is arranged at the top of the valve rod.
Another object of the present invention is to provide a method for adjusting a flow characteristic of a control valve according to any one of the above aspects, wherein the control valve is installed in a pipeline to be controlled for use, and the method comprises the following steps:
s1: determining the flow characteristic required to be met by the valve according to the target working condition, then rotating the valve rod to enable the valve core to move upwards to the limit position, engaging the lower thread on the valve rod with the central threaded hole of the inner sleeve, continuing rotating the valve rod in the same direction to enable the inner sleeve and the outer sleeve to relatively rotate until a throttling hole combination meeting the flow characteristic is formed, and enabling the internal flow passages of the valve inlet and the valve outlet to be communicated through the throttling hole combination;
s2: reversely rotating the valve rod to ensure that the lower thread on the valve rod is not meshed with the central threaded hole of the inner sleeve any more, the middle thread on the valve rod is meshed with the internal thread of the central through hole of the valve cover again to drive the valve core to move up and down, and the relation between the fluid flow combined by the throttling hole and the valve opening degree is the current flow characteristic of the valve;
s3: and when the target working condition is changed, repeating the steps from S1 to S2, and adjusting the flow characteristic of the valve to meet the new target working condition requirement.
The invention has the beneficial effects that:
according to the valve core assembly with the variable flow characteristic and the regulating valve, the sleeve rotation driving structure is integrated on the valve rod, the sleeve is rotated through the external regulating structure on the premise that the regulating valve is not disassembled, the ideal flow characteristic of the sleeve is changed, free and quick switching between two flow characteristics is realized, various working conditions are quickly adapted, and the use convenience of the regulating valve is improved; the execution structure is simple and compact, and the operation is simple; the execution stroke is short, and the switching of the flow characteristics can be realized by rotating the valve body for a small displacement.
Drawings
Fig. 1 is a schematic structural view of a valve core assembly with variable flow characteristics.
FIG. 2 is a schematic view of the arrangement of the expanded pores in the sidewall of the outer sleeve.
Figure 3 is a schematic view of the inner sleeve sidewall deployment aperture.
Fig. 4 is a schematic view of a variable flow rate characteristic control valve.
Fig. 5 is a schematic view of the regulator valve when the spool reaches the limit position.
In the figure: 1. a valve inlet; 2. a valve body; 3. an inner sleeve; 4. a valve stem; 5. a valve core; 6. a valve outlet; 7. a valve cover; 8. a central threaded hole of the inner sleeve; 9. a filler; 10. a packing gland; 11. driving a hand wheel; 12. the valve rod is provided with threads; 13. middle thread; 14. lower threads; 15. an outer sleeve.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. It should be understood that the specific examples described herein are intended to be illustrative only and are not intended to be limiting.
In one basic embodiment of the present invention, as shown in fig. 1, a variable flow characteristic valve cartridge assembly is provided, the main components of which include an outer sleeve 15, an inner sleeve 3 and a valve cartridge 5. The valve core assembly is used in a regulating valve body and is used for changing the inherent flow characteristic of the regulating valve without disassembling the valve body. The structure of the valve core assembly is described in detail below to illustrate the working principle thereof.
In this valve core assembly, the outer sleeve 15 and the inner sleeve 3 are core components that change the inherent flow characteristics of the regulator valve. The outer sleeve 15 is a hollow columnar part, and the outer wall of the outer sleeve is provided with a first orifice array which is periodically arranged along the circumferential direction, wherein the period number is M, and M is more than or equal to 1. Similarly, the inner socket 3 is a hollow columnar component, the inner socket 3 is mounted inside the outer socket 15, and the outer wall surface of the inner socket 3 is in contact with the inner wall surface of the outer socket 15, so that water does not directly leak between the two. Similar to the outer sleeve 15, the outer wall of the inner sleeve 3 is provided with a fluid inlet and a fluid outlet and a second orifice array which are periodically arranged along the circumferential direction, the period number is M, and M is more than or equal to 1. The number of the periodicity M is preferably multiple, and the periodicity M is uniformly distributed along the circumferential direction at equal angles, so that the flow area is increased, and the stability is improved.
In the present invention, one period essentially corresponds to one arc segment in the circumferential direction of the outer wall of the sleeve. The M periods in the first orifice array and the M periods in the second orifice array correspond to each other in spatial position one by one, each corresponding period is one adjusting unit for adjusting the flow characteristic, and the flow characteristic of the whole adjusting valve is finally determined by all the periods, namely all the adjusting units. In the first orifice array and the second orifice array, only one row of orifices A is provided in each cycle of one array0Another array having N rows of orifices A per cycleiN is more than or equal to 2. Throttle hole A0The adjustable throttle valve can be arranged on the first throttle hole array or the second throttle hole array and can be adjusted according to actual needs. If the orifice A is0May be provided in the first orifice array, then orifice aiNeed to be placed in the second orifice array if orifice aiMay be provided in the first orifice array, then orifice a0Need to be provided on the second orifice array.
In this embodiment, the orifice A0Disposed on the first orifice array, and an orifice AiIs disposed over the second orifice array with only one row of orifices a per cycle of the first orifice array0With N rows of orifices A in each cycle of the second orifice arrayi。
The inner sleeve 3 and the outer sleeve 15 are relatively rotated about the axis by the first actuator so that each set of the corresponding inner sleeve and the outer sleeve is rotatedIn cycles, there is one row of orifices A0Can be connected with N rows of orifices AiOne of the rows is coincident to form a row of coincident orifices. The overlapped orifice rows are the orifice rows formed by all the formed overlapped orifices after two rows of orifices are completely overlapped or partially overlapped, and the orifices which are not overlapped are blocked by the sleeve wall and can not pass through fluid. Due to each 1 column of orifices A0Can be connected with 1 row of orifices Ai1 row of combined orifices is formed, so that N rows of orifices A in one cycle during relative rotation of the inner sleeve 3 and the outer sleeve 15iThere may be a total of N types of orifice columns, except that only one type of orifice column exists at a certain transient state.
In the invention, the total number of the M periods is provided, and the flow characteristic of the whole regulating valve is finally determined by all the periods, so that M times of the M periods and the orifice rows can form an orifice combination. A total of N orifice combinations may occur during relative rotation of the inner sleeve 3 and the outer sleeve 15. The N throttling holes are combined to be designed into different flow characteristics, so that the flow characteristics of the valve core assembly can be adjusted in real time without disassembling the valve. Of course, the flow characteristics of these N orifice combinations need not all be completely different, but theoretically the flow characteristics of at least two orifice combinations may be different.
For a particular orifice combination, the specific valve flow is regulated by the spool 5. The valve core 5 is a columnar part, can be hollow or solid, and has the same function as the valve core in a common valve core assembly. The valve core 5 is arranged in the inner sleeve 3, the outer wall surface of the valve core 5 is attached to the inner wall surface of the inner sleeve 3, and the valve core 5 is driven by the second actuating element to relatively slide along the axial direction of the inner sleeve 3 so as to change the opening degree of the current effective orifice combination.
When the entire spool assembly is installed in the valve body, external fluid flows in from one of the fluid ports of the orifice combination and the inner sleeve 3 and out from the other. The meaning of "one" here is: with respect to the entire valve core assembly, when the orifice combination is selected as the inflow port, the other opening, namely the fluid inlet and outlet, becomes the outflow port, and when the fluid inlet and outlet is selected as the inflow port, the other opening, namely the orifice combination, becomes the outflow port. That is, when the valve core assembly has external fluid flowing through, the flow direction of the fluid can be adjusted according to actual conditions. In the embodiment shown in fig. 4, the external fluid flows in from the orifice combination and flows out from the fluid inlet and outlet of the inner sleeve 3. Generally, the fluid inlet and outlet of the inner sleeve 3 may be provided at the bottom surface of the cylinder of the inner sleeve 3.
In the present invention, the orifice A0And an orifice AiThe diameters of the orifices (2) may be completely the same or different, and when the diameters of the orifices are different from each other, the flow area of the superposed orifices is determined by the orifice having a smaller diameter.
For one orifice combination, the flow characteristics can be varied in different ways. For example, the shape of the overlapping holes, the number of overlapping holes, the size of the overlapping holes, the vertical spacing of the holes in the overlapping orifice rows, different combinations of overlapping orifice rows, and the like, may change the flow characteristics of the orifice combination. Therefore, the implementation form can be flexibly set.
In the present embodiment, the settings for the convenience of adjustment are as follows: in the first orifice array, each row of orifices A0Has the same number of holes, each orifice A0The pore diameter of (A) is also the same; n rows of orifices A in each cycle of the second orifice arrayiEach orifice A iniAperture of and orifice A0Is identical, but has at least two rows of orifices AiSo that the two rows of orifices AiAnd a row of orifices A0The number of overlapping holes is different. Therefore, it is possible to easily change each row of orifices AiThe flow rate characteristic of the orifice combination is adjusted by the number of the holes, and in this way, the flow rate characteristic is easier to control because the hole diameters of the superposed holes are equal. Further, in this embodiment, the pitch of any two vertically adjacent orifices in each row of orifices in the first orifice array and the second orifice array may be set to be identical, so as to realize linear adjustment of the flow rate characteristic.
In addition, it should be noted that although the orifice arrays of both sleeve surfaces are periodically arranged in the circumferential direction in the present invention, it is not necessary that each period be identical to each other. Where a cycle represents only one cell, differences are allowed between cycles. That is, the M-columns may be identical, partially identical, or completely different in combination with the orifice rows in each orifice combination. The number of overlapping orifices of the M columns of overlapping orifice rows may be all the same, partially the same, or completely different, provided that the flow characteristics are changed by the number of overlapping orifices.
In the present invention, since the side wall area of the sleeve is fixed, the orifice a in one cycleiThe more the number of rows, the single row of orifices AiThe smaller the flow area. Therefore, in order to ensure the flow area of the valve body, the value of N is not too large, and the optimal range is that N is more than or equal to 2 and less than or equal to 4. On the basis of the above-described embodiment of the present invention, a preferable embodiment may be provided in which N of the second orifice array is set to 2. At this time, the side wall development of the outer sleeve 15 is shown in fig. 2, and the side wall development of the inner sleeve 3 is shown in fig. 3. In the inner sleeve 3, orifices A are arranged in an odd number of rows1And orifices A of an even column of adjacent columns2Is one cycle. In the outer sleeve 15, one row of orifices A0Is a period corresponding to the orifice A2The corresponding columns are not apertured. Further, the orifices A are formed in two adjacent rows in the outer sleeve 15 and the inner sleeve 31Pitch and two adjacent rows of orifices a2The pitch of the holes is equal to that of two adjacent rows of orifices A0Are equally spaced, and the orifices a of one adjacent row are1And a row of orifices A2With two adjacent rows of orifices A0Half of the pitch of (a). In this valve, an orifice A1And an orifice A0Can be combined into a throttling hole combination to realize the flow characteristic under a working condition, and the throttling hole A2And an orifice A0And the combination can be combined into another throttling hole combination to realize the flow characteristic under another working condition. The linear flow characteristics belong to the requirements in practical applicationThe requirement is relatively common, so that each row of orifices A can be used0And each row of orifices A1The number and the pitch of the orifices in the two-stage flow-rate control valve are equal, and the combination of the orifices formed by the two has a linear flow rate characteristic; while each row of orifices A0And each row of orifices A2The hole pitch of the orifices is set to be equal, but the number of the orifices is set to be different, the combination of the orifices formed by the two has nonlinear flow characteristics, and the specific selection of the characteristics can be adjusted according to needs without limitation.
The valve core assembly can be installed in a regulating valve for use, and the regulating valve can be a regulating valve with a straight-through valve body, a straight-through valve body or an angle valve body, and is not limited. The basic structure of the regulating valve comprises a valve cover, a valve body and the valve core assembly in any one of the embodiments. The valve cover is arranged on the valve body, and an internal flow passage leading from the inlet of the valve to the outlet of the valve is formed in the valve body. The valve core assembly is disposed in the internal flow passage, and fluid flowing from the valve inlet flows into the valve core assembly through the orifice combination overlapped with the inner sleeve 3 and the outer sleeve 15, flows out from the fluid inlet and outlet of the inner sleeve 3, and is discharged from the valve outlet. Of course, in other embodiments, if the fluid flow direction is reversed, fluid flowing from the valve inlet will flow out of the valve cartridge assembly through the orifice combination and will eventually exit the valve outlet.
The regulating valve is installed in a pipeline to be regulated for use, and when the flow characteristic is regulated, the basic steps are as follows:
s1: determining the flow characteristic required to be met by the valve according to the target working condition, adjusting the valve core 5 to move upwards to the limit position through the second actuating element, and enabling the inner sleeve 3 and the outer sleeve 15 to rotate relatively through the first actuating element until a throttling hole combination meeting the flow characteristic is formed, and enabling the internal flow passages of the valve inlet and the valve outlet to be communicated through the throttling hole combination;
s2: the valve core 5 is driven by the second actuating element to move up and down, and the relationship between the fluid flow passing through the orifice combination and the valve opening is the current flow characteristic of the valve;
s3: and when the target working condition is changed, repeating the steps from S1 to S2, and adjusting the flow characteristic of the valve to meet the new target working condition requirement.
In the valve core assembly, the forms of the first actuating member and the second actuating member are not limited, and can be realized by adopting a mechanical control structure, an electromagnetic control structure and the like, so as to drive the inner sleeve 3 and the valve core 5. The first actuating member and the second actuating member may be two different actuating members or may be the same actuating member. In view of manufacturing convenience, the first and second actuating members are preferably implemented as valve stems that drive the inner sleeve 3 and the valve cartridge 5 to move axially by moving axially. The valve rod can be one or more, and the plurality of valve rods can be realized in a nesting mode.
For ease of understanding, a preferred arrangement of the valve core assembly and the particular valve body will now be described by way of example with reference to an actuator in the form of a valve stem.
As shown in fig. 4, in the present embodiment, a variable flow rate characteristic control valve includes a valve body 2, an inner sleeve 3, a valve rod 4, a valve core 5, a valve cover 7, a packing 9, a packing gland 10, a driving hand wheel 9, and an outer sleeve 15;
the valve body 2 is hollow and provided with three ports, wherein the three ports comprise a valve inlet 1, a valve outlet 6 and a mounting port, the valve inlet 1 and the valve outlet 6 are used for fluid to flow into and flow out of the valve, the valve inlet 1 is communicated with the valve outlet 6 through an inner sleeve 4 and an outer sleeve 15 of a middle cavity of the valve body 2, and the central lines of the valve inlet 1 and the valve outlet 6 are positioned on the same straight line; the mounting port is used for mounting parts in the valve into the valve body 2; the outer sleeve 15 and the inner sleeve 3 are concentrically arranged in the middle cavity of the valve body 2, two ends of the outer sleeve 15 are respectively supported in contact with the valve body 2 and the valve cover 7, and the outer sleeve 15 is in clearance fit with the inner sleeve 3.
The center of the top of the inner sleeve 3 is provided with an inner sleeve center threaded hole 8, and the center of the valve cover 7 is provided with a through hole with inner tapping. The first and second actuators are the same valve stem 4, and the upper, middle and lower portions of the valve stem 4 are tapped with upper, middle and lower threads 12, 13 and 14, respectively. The valve rod 4 sequentially passes through a central through hole of the valve cover 7 and a central threaded hole 8 of the inner sleeve from the outside and extends into the valve core assembly. The top end of the valve rod 4 is tightly connected with the driving hand wheel 11 through external surface threads, the middle threads 13 of the valve rod 4 can be meshed with the internal threads of the central through hole of the valve cover 7 to form a screw pair for driving the valve rod 4 and the valve core 5 to axially move, and the bottom of the valve rod 4 is tightly connected with the valve core 5 through external surface threads.
The valve cover 7 and the valve rod 4 are sealed through a sealing packing 9 and a packing gland 10, a threaded hole is formed in the center of the packing gland 10, a thread 12 on the valve rod is meshed with the central threaded hole of the packing gland, the valve cover 7 and the valve body 2 are connected through bolts and nuts, and the packing gland 10 and the valve cover 7 are connected through bolts and nuts.
The valve rod 4 can drive the valve core 5 to move up and down along the axial direction of the valve rod in the inner sleeve 3 by rotating the driving hand wheel 11. As shown in the attached figure 5, when the valve core 5 moves upwards to the limit position, the valve core 5 is contacted with the top end of the inner sleeve 3, meanwhile, the lower thread 14 of the valve rod is meshed with the central threaded hole 8 of the inner sleeve, the thread 13 in the valve rod is not meshed with the central through hole thread of the valve cover 7, the hand wheel 11 is continuously driven to rotate along the original direction, the valve rod 4 cannot continuously move, but because the top of the valve core 5 is contacted with the top surface of the inner sleeve 3 at the moment, the inner sleeve 3 can be driven by the valve rod 4 to rotate around the axis of. The outer sleeve 15 and the inner sleeve 3 are clearance fitted so that the outer sleeve 15 remains fixed and the inner sleeve 3 rotates relative to the outer sleeve 15.
As shown in the attached figures 2 and 3, the annular wall surface of the outer sleeve 15 is provided with small holes which are uniformly distributed, the annular distance and the axial distance of the small holes are kept constant, meanwhile, the axial distribution quantity and the annular distribution quantity of the small holes are kept constant, and the annular wall surface A of the outer sleeve 15 is provided with a plurality of small holes0The number and the spacing of the small holes in the rows are equal to the odd rows A on the circumferential wall surface of the inner sleeve 31The hole number and the distance are kept equal; the circumferential distance of the small holes on the circumferential wall surface of the inner sleeve 3 is half of the circumferential distance of the small holes of the outer sleeve 15; the axial distance and the diameter of the small holes of the outer sleeve 15 and the inner sleeve 3 are equal, and the even rows A on the circumferential wall surface of the inner sleeve 32The number of the small holes can be freely adjusted according to the flow characteristic requirement.
A of the outer sleeve 150A of row of holes with inner sleeve 31When the row small holes are aligned, the linear flow characteristic can be realized; after rotating the inner sleeve 3, A of the outer sleeve 150Row of holes and inner sleeveA of the cartridge 32When the row small holes are aligned, equal percentage flow characteristics can be realized.
The flow characteristic adjusting method of the adjusting valve based on the variable flow characteristic comprises the following operation steps,
(1) in the initial condition, A of the outer sleeve 150A of row of holes with inner sleeve 31The small holes are aligned to meet the requirement of the initial flow characteristic, the hand wheel 11 is driven to rotate, the valve core 5 moves up and down, the valve opening and the flow of the fluid passing through the valve change along with the small holes, and the relationship between the flow of the fluid passing through the valve and the valve opening is the initial flow characteristic.
(2) When the working condition changes, the hand wheel 11 is driven to rotate, so that the valve core 5 moves upwards to the limit position at the maximum opening.
(3) When the valve core reaches the limit position of the maximum opening, the lower thread 14 of the valve rod is tightly meshed with the central threaded hole of the inner sleeve 8, the hand wheel 11 is continuously driven to rotate along the original rotating direction, and the rotating angle is the included angle between two adjacent rows of small holes in the circumferential wall surface of the outer sleeve, so that the A of the outer sleeve 15 is enabled to be an included angle0A of row of holes with inner sleeve 32The column apertures are aligned.
(4) The hand wheel 11 is driven by reverse rotation to make the valve core 5 move downwards, the valve opening and the fluid flow passing through the valve change along with the valve opening, and the relationship between the fluid flow passing through the valve and the valve opening is the valve flow characteristic under the new working condition.
(5) And (5) when the working condition changes again, repeating the step (2) to the step (4).
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (10)
1. A valve core assembly with variable flow characteristics is characterized by comprising an outer sleeve (15), an inner sleeve (3) and a valve core (5);
the outer sleeve (15) is a hollow columnar part, the outer wall of the outer sleeve is provided with a first throttling hole array which is periodically arranged along the circumferential direction, the period number is M, and M is more than or equal to 1;
the inner sleeve (3) is a hollow columnar part, the inner sleeve (3) is arranged inside the outer sleeve (15), the outer wall surface of the inner sleeve (3) is attached to the inner wall surface of the outer sleeve (15), a fluid inlet and a fluid outlet and a second throttling hole array which are periodically arranged along the circumferential direction are formed in the outer wall of the inner sleeve (3), the period number is M, and M is larger than or equal to 1;
m periods in the first orifice array and M periods in the second orifice array are in one-to-one correspondence, wherein only one column of orifices A exists in each period of one array0Another array having N rows of orifices A per cycleiN is more than or equal to 2; the inner sleeve (3) and the outer sleeve (15) are relatively rotated about the axis by the first actuator such that in each cycle there is a row of orifices A0Can be connected with the N rows of orifices AiOne of the rows is overlapped to form a row of overlapped throttle holes; n orifice combinations can be formed in the relative rotation process of the inner sleeve (3) and the outer sleeve (15), each orifice combination is composed of M combined orifice rows, and the flow characteristics of at least two orifice combinations in the N orifice combinations are different;
the valve core (5) is a columnar part and is arranged in the inner sleeve (3), the outer wall surface of the valve core (5) is attached to the inner wall surface of the inner sleeve (3), and the valve core (5) is driven by the second actuating element to relatively slide along the axial direction of the inner sleeve (3) so as to change the opening degree of the throttling hole combination;
external fluid flows in from one of the orifice combination and the fluid inlet/outlet and flows out from the other.
2. The variable flow characteristic spool assembly of claim 1 wherein there is only one row of orifices a per cycle of the first orifice array0The second orifice array has N rows of orifices A in each cyclei(ii) a Preferably, 2. ltoreq. N.ltoreq.4.
3. As in claimThe variable flow rate characteristic spool assembly of claim 1, wherein each of the first orifice array rows includes orifices a0Has the same number of holes, each orifice A0The pore diameter of (A) is also the same; n rows of orifices A in each cycle of the second orifice arrayiEach orifice A iniAperture of and orifice A0Is identical, but has at least two rows of orifices AiSo that the two rows of orifices AiAnd a row of orifices A0The number of overlapping holes is different; preferably, in the first orifice array and the second orifice array, the pitch of any two vertically adjacent orifices in each row of orifices is equal.
4. A variable flow characteristic valve cartridge assembly according to claim 3 wherein in each of said orifice combinations the number of overlapping orifices in the M overlapping orifice rows are all the same, partially the same or completely different.
5. The valve core assembly with the variable flow characteristic according to any one of claims 1 to 4, wherein N is 2 in the second orifice array, and one row of the orifices A with an odd number is provided1And orifices A of an even column of adjacent columns2Is one cycle; two adjacent rows of orifices A on the outer sleeve (15) and the inner sleeve (3)1Pitch and two adjacent rows of orifices a2The pitch of the holes is equal to that of two adjacent rows of orifices A0Are equally spaced, and the orifices a of one adjacent row are1And a row of orifices A2With two adjacent rows of orifices A0Half of the pitch of (a).
6. The variable flow rate characteristic spool assembly of claim 2 wherein each row of orifices a0And each row of orifices A1The number and the pitch of the orifices in the two-stage flow meter are equal, and the combination of the orifices formed by the two has a linear flow characteristic; each row of orifices A0And each row of orifices A2The orifices of (2) have the same pitch but different numbers, and the combination of the orifices is formed by the twoHas non-linear flow characteristics.
7. A variable flow characteristic regulating valve is characterized by comprising a valve cover (7), a valve body (2) and a valve core assembly of any one of claims 1 to 6; the valve cover (7) is arranged on the valve body (2), and an internal flow passage leading from a valve inlet to a valve outlet is formed inside the valve body (2); the valve core assembly is arranged in the internal flow passage, and fluid flowing in from the valve inlet flows through the superposed throttling holes in the inner sleeve (3) and the outer sleeve (15) and is discharged from the valve outlet.
8. The variable flow characteristic regulating valve according to claim 7, wherein the first actuating member and the second actuating member are valve rods (4), the bottoms of the valve rods (4) are fixedly connected with the valve core (5), middle threads (13) and lower threads (14) are respectively tapped at the middle parts and the lower parts of the valve rods (4), an inner sleeve central threaded hole (8) is formed in the top of the inner sleeve (3), and the valve rods (4) sequentially penetrate through the inner sleeve central threaded hole (8) and a central through hole of the valve cover (7); the valve rod (4) can be meshed with the internal thread of the central through hole of the valve cover (7) through the middle thread (13) to form a screw pair for driving the valve rod (4) and the valve core (5) to axially move; when the valve core (5) moves upwards to the limit position by rotating the valve rod (4), the valve core (5) is contacted with the top end of the inner sleeve (3), meanwhile, a lower thread (14) on the valve rod (4) is meshed with a central threaded hole (8) of the inner sleeve, a middle thread (13) on the valve rod (4) is not meshed with a central through hole thread of the valve cover (7), the valve rod (4) continues to rotate along the original direction, and the inner sleeve (3) is driven to rotate around the axis of the valve rod (4) relative to the outer sleeve (15).
9. The variable flow characteristic regulator valve according to claim 8, wherein the outer sleeve (15) is clearance fitted with the inner sleeve (3); the valve cover (7) and the valve rod (4) are sealed through a sealing packing (9) and a packing gland (10); and a driving hand wheel (11) is arranged at the top of the valve rod (4).
10. A flow characteristic adjustment method using the adjustment valve according to any one of claims 7 to 9, the adjustment valve being installed in a pipe to be adjusted for use, characterized by comprising the steps of:
s1: determining the flow characteristic required to be met by the valve according to the target working condition, then rotating the valve rod (4) to enable the valve core (5) to move upwards to the limit position, engaging a lower thread (14) on the valve rod (4) with a central threaded hole (8) of an inner sleeve, continuing rotating the valve rod (4) in the same direction to enable the inner sleeve (3) and an outer sleeve (15) to relatively rotate until a throttling hole combination meeting the flow characteristic is formed, and enabling the internal flow passages of a valve inlet and a valve outlet to be communicated through the throttling hole combination;
s2: reversely rotating the valve rod (4) to ensure that a lower thread (14) on the valve rod (4) is not meshed with a central threaded hole (8) of the inner sleeve any more, a middle thread (13) on the valve rod (4) is meshed with an inner thread of a central through hole of the valve cover (7) again to drive the valve core (5) to move up and down, and the relation between the fluid flow rate of the throttling hole combination and the valve opening degree is the current flow characteristic of the valve;
s3: and when the target working condition is changed, repeating the steps from S1 to S2, and adjusting the flow characteristic of the valve to meet the new target working condition requirement.
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| CN202010722905.5A CN111853342B (en) | 2020-07-24 | 2020-07-24 | Valve core assembly with variable flow characteristic, regulating valve and regulating method of regulating valve |
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| CN113738948A (en) * | 2021-08-25 | 2021-12-03 | 浙江大学 | Valve core structure capable of realizing large adjustable ratio and high adjustment precision, adjusting valve and method |
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|---|---|
| CN111853342B (en) | 2021-11-02 |
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